This is postmarked in 2013 with two matching Croatia stamps.
There is no description on the back, however, what is shown is this:
Top: Aerial View
Bottom left: Sponza Palace
Bottom Center: St. Blaise Church
Bottom right: Onuphrius' Fountain
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Dubrovnik is a Croatian city on the Adriatic Sea, in the region of Dalmatia. In 1979, the city of Dubrovnik joined the UNESCO list of World Heritage Sites.
Croatia (Republika Hrvatska)